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Articles 1621 - 1650 of 4180
Full-Text Articles in Engineering
Design And Optimization Of Superjunction Vertical Dmos Power Transistors Using Sentaurus Device Simulation, Raul Mendoza Macias
Design And Optimization Of Superjunction Vertical Dmos Power Transistors Using Sentaurus Device Simulation, Raul Mendoza Macias
Electronic Theses and Dissertations
Vertical double-diffused metal oxide semiconductor (VDMOS) power transistor has been studied. The use of superjunction (SJ) in the drift region of VDMOS has been evaluated using three-dimensional device simulation. All relevant physical models in Sentaurus are turned on. The VDMOS device doping profile is obtained from process simulation. The superjunction VDMOS performance in off-state breakdown voltage and specific on-resistance is compared with that in conventional VDMOS structure. In addition, electrical parameters such as threshold voltage and charge balance are also examined. Increasing the superjunction doping in the drift region of VDMOS reduces the on-resistance by 26%, while maintaining the same …
Three-Dimensional Simulation Study Of Low Voltage (<100v) Superjunction Lateral Dmos Power Transistors, Jhonatan Garcia
Three-Dimensional Simulation Study Of Low Voltage (<100v) Superjunction Lateral Dmos Power Transistors, Jhonatan Garcia
Electronic Theses and Dissertations
A new revolutionary concept was presented two decades ago, known as "semiconductor Superjunction (SJ) theory" to enhance the trade-off relationship between specific on resistance, Rsp, and off-state breakdown voltage, BV, in medium to high voltages (more than 100 V) power MOSFETs. The SJ concept was first applied and commercialized to vertical structures, but it hasn't been used yet in low voltage MOSFETs with lateral structures. This thesis provides a review of the most common structures, principles and design techniques for discrete power MOSFETs. It also presents a simulation study of the application of these SJ concepts in the design of …
Method For Derivation And Synthesis Of Electromagnetic Environmental Effects Requirement Limits For Achieving System Level Electromagnetic Compatibility, Larry Freeman
Electronic Theses and Dissertations
As humans endeavor to build large-scale complex systems, it will necessitate the integration of engineering practices and techniques to allocate many of the design aspects and responsibility across traditional boundaries. Many of today's large-scale complex systems, like commercial aircraft, satellite systems, and even automobiles use parts from all over the world. A recently completed airframe, largest commercial aircraft in the world, took nearly 30 years to build, required over 400 different suppliers from 20 different countries. These kinds of projects dictate a method for derivation and synthesis of electromagnetic environmental effects (E3) requirement limits for achieving system level electromagnetic compatibility …
An Integrated Design For Six Sigma-Based Framework To Align Strategy, New Process Development, And Customer Requirements In The Airlines Industry, Mohammed Alghamdi
An Integrated Design For Six Sigma-Based Framework To Align Strategy, New Process Development, And Customer Requirements In The Airlines Industry, Mohammed Alghamdi
Electronic Theses and Dissertations
When organizations create new strategy maps, key new processes are often identified. This is important for organizations to stay competitive in the global marketplace. This document describes the development, implementation, and validation of a framework that properly aligns and links an organization's strategy and new process development. The proposed framework integrates the Balanced Scorecard management system (BSC) and the Design for Six Sigma (DFSS) methodology, leveraging their strengths, overcoming weaknesses, and identifying lessons learned to help bridge the gap between strategy development and execution. The critical-to-quality conceptual model is used as an integrative component for the framework. Literature search has …
Applied Advanced Error Control Coding For General Purpose Representation And Association Machine Systems, Bowen Dai
Electronic Theses and Dissertations
General-Purpose Representation and Association Machine (GPRAM) is proposed to be focusing on computations in terms of variation and flexibility, rather than precision and speed. GPRAM system has a vague representation and has no predefined tasks. With several important lessons learned from error control coding, neuroscience and human visual system, we investigate several types of error control codes, including Hamming code and Low-Density Parity Check (LDPC) codes, and extend them to different directions. While in error control codes, solely XOR logic gate is used to connect different nodes. Inspired by bio-systems and Turbo codes, we suggest and study non-linear codes with …
Virtual Resistance Based Dc-Link Voltage Regulation For Microgrid Dg Inverters., Siddhesh Shinde
Virtual Resistance Based Dc-Link Voltage Regulation For Microgrid Dg Inverters., Siddhesh Shinde
Electronic Theses and Dissertations
This research addresses the practical issues faced by Microgrid Distributed Generation (DG) inverters when operated in islanded mode. A Microgrid (MG) is an interconnection of domestic distributed loads and low voltage distributed energy sources such as micro-turbine, wind-turbine, PVs and storage devices. These energy sources are power limited in nature and constrain the operation of DG inverters to which they are coupled. DG inverters operated in islanded mode should maintain the power balance between generation and demand. If DG inverter operating in islanded mode drains its source power below a certain limit or if it is incapable of supplying demanded …
Analysis Of Driving Behavior At Expressway Toll Plazas Using Driving Simulator, Moatz Saad
Analysis Of Driving Behavior At Expressway Toll Plazas Using Driving Simulator, Moatz Saad
Electronic Theses and Dissertations
The objective of this study is to analyze the driving behavior at toll plazas by examining multiple scenarios using a driving simulator to study the effect of different options including different path decisions, various signs, arrow markings, traffic conditions, and extending auxiliary lanes before and after the toll plaza on the driving behavior. Also, this study focuses on investigating the effect of drivers' characteristics on the dangerous driving behavior (e.g. speed variation, sudden lane change, drivers' confusion). Safety and efficiency are the fundamental goals that transportation engineering is always seeking for the design of highways. Transportation agencies have a crucial …
The Effect Of Glycerol On Readily Biodegradable Chemical Oxygen Demand (Rbcod) In A Wastewater Stream, Rojina Rawut
The Effect Of Glycerol On Readily Biodegradable Chemical Oxygen Demand (Rbcod) In A Wastewater Stream, Rojina Rawut
Electronic Theses and Dissertations
This study evaluated the short-term effects of glycerol addition on readily biodegradable (RB) chemical oxygen demand (COD) in a carbon limited wastewater influent. The presence of an RB fraction provides with a suitable substrate for microorganisms to produce volatile fatty acids (VFA). The oxygen utilization rate (OUR) has been used to evaluate the oxygen consumption for RB substrate in wastewater. Wastewater with low organic content contains limited RB substrate, and thus, additional carbon source is required to improve biological treatment capability. Acetate, propionate, methanol, and glycerol are the commonly available carbon sources for biological treatment process. However, the cost of …
High Temperature Mechanics Of Aerospace Ceramic Composites Via Synchrotron Radiation, Albert Manero Ii
High Temperature Mechanics Of Aerospace Ceramic Composites Via Synchrotron Radiation, Albert Manero Ii
Electronic Theses and Dissertations
This research investigates the mechanics of complex aerospace material systems designed for extreme environments. Ceramics and ceramic matrix composites (CMCs) provide highly sought-after capabilities including the potential to withstand extreme temperatures and heat fluxes, severe oxidation and mechanical stresses. Two important material systems form the basis of the scope for this effort: i) thermal barrier coatings (TBCs) on Ni-superalloys that have enabled dramatic increases in turbine inlet temperatures exceeding 1100°C; and ii) ceramic matrix composites that have shown capability and promise for hypersonic applications beyond 1300°C. Understanding the mechanical and material properties of these materials as they evolve with temperature …
Integrating Spray Aeration And Granular Activated Carbon For Disinfection By-Product Control In A Potable Water System, Angela Rodriguez
Integrating Spray Aeration And Granular Activated Carbon For Disinfection By-Product Control In A Potable Water System, Angela Rodriguez
Electronic Theses and Dissertations
Public water systems add disinfectants in water treatment to inactivate microbial pathogens. Chlorine, when used as a disinfectant, reacts with natural organic matter in the water to form trihalomethane (THM) and haloacetic acid (HAA5) disinfection by-products (DBPs), which are suspected carcinogens. The Safe Drinking Water Act's Disinfectant and Disinfection By-Product (D/DBP) Rules were promulgated by the U.S. Environmental Protection Agency to regulate the amount of DBPs in water systems. Regulatory compliance is based on maximum contaminant levels (MCL), measured as a locational running annual average (LRAA), for total THM (TTHM) and HAA5 of 80 µg/L and 60 µg/L, respectively. Regulated …
Heat Transfer And Pressure Measurements From Jet Array Impingement Onto A Large Radius Curved Surface, John Harrington
Heat Transfer And Pressure Measurements From Jet Array Impingement Onto A Large Radius Curved Surface, John Harrington
Electronic Theses and Dissertations
This study investigates the heat transfer and pressure drop characteristics of jet array impingement in two distinct parts. In the first part, the performance of a uniform array of jets on both a flat and a large radius curved target surface are compared. This comparison was done at average jet Reynolds number ranging from 55,000 to 125,000. In the second part, the characteristics of a non-uniform array of jets, more typical of geometries used in actual gas turbine combustors, are investigated, including the effects of the removal of downstream rows and the placement of rib features onto the target surface. …
An Experimental Investigation Of The State Of Creativity, Critical Thinking And Creativity Training In Undergraduate Engineering Students, Eric Sola
Electronic Theses and Dissertations
This research explores creativity and critical thinking skills in undergraduate engineering students. The study undertook two experiments in order to gather a better understanding of several factors regarding the interactions between students' creative abilities and the effects of the undergraduate engineering curriculum. Experiment 1 focused on the differences in creative and critical thinking skills in freshman versus senior undergraduate engineering students. Experiment 2 centered on the variation in the effects of long-term versus short-term creativity training on senior engineering students. Creative skill was measured using the Test for Creative Thinking – Drawing Production (TCT-DP) developed by Urban and Jellen (2010). …
The Effect Of Recycled Backwash Water Operations On Fouling In A Coagulation-Ultrafiltration Process And Impact Of Preozonation On Membrane Productivity, Paul Biscardi
Electronic Theses and Dissertations
This dissertation consists of research that focused on pretreatment strategies to reduce fouling of ultrafiltration (UF) membranes used for drinking water treatment, and was segmented into four key components. (1) In the first component of the work, the long-term fouling behavior of a polyethersulfone (PES) hollow-fiber UF membrane was studied at the pilot-scale for treatment of surface water over a one-year period. Pilot testing of a coagulation-flocculation-sedimentation (CFS) pretreatment system revealed that chemically irreversible fouling was poorly correlated with turbidity and total organic carbon. It was also shown that recycled backwash water may have impacted membrane process performance, and that …
A Priori Synthetic Sampling For Increasing Classification Sensitivity In Imbalanced Data Sets, William Rivera
A Priori Synthetic Sampling For Increasing Classification Sensitivity In Imbalanced Data Sets, William Rivera
Electronic Theses and Dissertations
Building accurate classifiers for predicting group membership is made difficult when data is skewed or imbalanced which is typical of real world data sets. The classifier has the tendency to be biased towards the over represented group as a result. This imbalance is considered a class imbalance problem which will induce bias into the classifier particularly when the imbalance is high. Class imbalance data usually suffers from data intrinsic properties beyond that of imbalance alone. The problem is intensified with larger levels of imbalance most commonly found in observational studies. Extreme cases of class imbalance are commonly found in many …
Rf Circuit Designs For Reliability And Process Variability Resilience, Ekavut Kritchanchai
Rf Circuit Designs For Reliability And Process Variability Resilience, Ekavut Kritchanchai
Electronic Theses and Dissertations
Complementary metal oxide semiconductor (CMOS) radio frequency (RF) circuit design has been an ever-lasting research field. It has gained so much attention since RF circuits offer high mobility and wide-band efficiency, while CMOS technology provides the advantage of low cost and high integration capability. At the same time, CMOS device size continues to scale to the nanometer regime. Reliability issues with RF circuits have become more challenging than ever before. Reliability mechanisms, such as gate oxide breakdown, hot carrier injection, negative bias temperature instability, have been amplified as the device size shrinks. In addition, process variability becomes a new design …
Anthropogenic Organic Chemical Removal From A Surficial Groundwater And Mass Transfer Modeling In A Nanofiltration Membrane Process, Samantha Black
Anthropogenic Organic Chemical Removal From A Surficial Groundwater And Mass Transfer Modeling In A Nanofiltration Membrane Process, Samantha Black
Electronic Theses and Dissertations
This dissertation reports on research related to trace organic compounds (TrOCs) in surficial groundwater supplies and their subsequent removal from nanofiltration (NF) membranes. The research was conducted along coastal South Florida in cooperation with the Town of Jupiter Water Utilities, Jupiter, FL (Town). The focus of the research was to determine the extent of reclaimed water impacts on surficial groundwater supplies and subsequent effects on the Town's NF water treatment plant. Routine monitoring of fourteen TrOCs in reclaimed water and at the water treatment facility revealed varying degrees of TrOC detection in the environment. Certain TrOCs, including caffeine and DEET, …
Advanced Metrology And Diagnostic Loss Analytics For Crystalline Silicon Photovoltaics., Eric Schneller
Advanced Metrology And Diagnostic Loss Analytics For Crystalline Silicon Photovoltaics., Eric Schneller
Electronic Theses and Dissertations
Characterization plays a key role in developing a comprehensive understanding of the structure and performance of photovoltaic devices. High quality characterization methods enable researchers to assess material choices and processing steps, ultimately giving way to improved device performance and reduced manufacturing costs. In this work, several aspects of advanced metrology for crystalline silicon photovoltaic are investigated including in-line applications for manufacturing, off-line applications for research and development, and module/system level applications to evaluate long-term reliability. A frame work was developed to assess the cost and potential value of metrology within a manufacturing line. This framework has been published to an …
Quantification Of The Effect Of Degassing On The Microstructure, Chemistry And Estimated Strength Of Nanocrystalline Aa5083 Powder, Clara Hofmeister
Quantification Of The Effect Of Degassing On The Microstructure, Chemistry And Estimated Strength Of Nanocrystalline Aa5083 Powder, Clara Hofmeister
Electronic Theses and Dissertations
Degassing is a critical heat treatment process in aluminum powder metallurgy, where powders are subjected to high temperature in vacuum to remove volatile gaseous species absorbed in and adsorbed on powders. For cryomilled aluminum alloy powders with nanoscale features, degassing can cause accelerated microstructural and chemical changes including removal of volatiles, grain growth, dislocation annihilation, and formation of dispersoids. These changes can significantly alter the mechanical behavior of consolidated components based on their contributions to strength. In this study, cryomilled AA5083 (0.4 wt.% Mn; 4.5 wt.% Mg; minor Si, Fe, Cu, Cr, Zn, Ti; balance Al) powders were degassed at …
An Integrated Hydrodynamic-Marsh Model With Applications In Fluvial, Marine, And Mixed Estuarine Systems, Karim Alizad
An Integrated Hydrodynamic-Marsh Model With Applications In Fluvial, Marine, And Mixed Estuarine Systems, Karim Alizad
Electronic Theses and Dissertations
Coastal wetlands experience fluctuating productivity when subjected to various stressors. One of the most impactful stressors is sea level rise (SLR) associated with global warming. Research has shown that under SLR, salt marshes may not have time to establish an equilibrium with sea level and may migrate landward or become open water. Salt marsh systems play an important role in the coastal ecosystem by providing intertidal habitats and food for birds, fish, crabs, mussels, and other animals. They also protect shorelines by dissipating flow and damping wave energy through an increase in drag forces. Due to the serious consequences of …
A New Path Planning Guidance Law For Improved Impact Time Control Of Missiles And Precision Munitions, Mark Snyder
A New Path Planning Guidance Law For Improved Impact Time Control Of Missiles And Precision Munitions, Mark Snyder
Electronic Theses and Dissertations
A new missile guidance law is proposed for the control of impact time which provides an improved time-to-go calculation by removing error due to trajectory curvature and also provides a family of trajectories for trajectory planning purposes. Unlike conventional optimal guidance laws, the proposed law is non explicit in time-to-go and the linearization of the engagement kinematics in order to gain a closed form solution is not necessary.
Uncooled Infrared Detector Featuring Silicon Based Nanoscale Thermocouple, Mohammad Modarres-Zadeh
Uncooled Infrared Detector Featuring Silicon Based Nanoscale Thermocouple, Mohammad Modarres-Zadeh
Electronic Theses and Dissertations
The main focus of this dissertation is to improve the performance of thermoelectric (TE) infrared (IR) detectors. TE IR detectors are part of uncooled detectors that can operate at room temperature. These detectors have been around for many years, however, their performance has been lower than their contesting technologies. A novel high-responsivity uncooled thermoelectric infrared detector is designed, fabricated, and characterized. This detector features a single standalone polysilicon-based thermocouple (without a supporting membrane) covered by an umbrellalike optical-cavity IR absorber. It is proved that the highest responsivity in the developed detectors can be achieved with only one thermocouple. Since the …
Getting To Net Zero Energy Buildings: A Holistic Techno-Ecological Modeling Approach, Mehdi Alirezaei
Getting To Net Zero Energy Buildings: A Holistic Techno-Ecological Modeling Approach, Mehdi Alirezaei
Electronic Theses and Dissertations
Buildings in the United States are responsible for more than 40% of the primary energy and 70% of electricity usage and greatly in CO2 emission by about 39%, more than any other sector including transportation and industry sectors. This energy consumption is expected to grow mainly due to increasing trends in new buildings construction. Rising energy prices alongside with energy independencies, limited resources, and climate change have made the current situation even worse. An Energy Efficient (EE) building is able to reduce the heating and cooling load significantly compared with a code compliant building. Furthermore, integrating renewable energy sources in …
Transient Cfd Analysis Of Autorotation Using Hybrid Les And Adaptive Mesh Morphing Techniques, Patricia Coronado Domenge
Transient Cfd Analysis Of Autorotation Using Hybrid Les And Adaptive Mesh Morphing Techniques, Patricia Coronado Domenge
Electronic Theses and Dissertations
Large-Eddy Simulation (LES) based turbulence modeling is a developing area of research in Fluid-Structure Interaction (FSI). There is considerable scope for further scientific research in this field and this dissertation aims to extend it to the study of flow-induced motion. The emphasis of this work is on autorotation, an important category of flow-induced motion that is commonly seen in energy applications such as wind turbines and in aviation applications such as the autogyro. In contrast to existing works on FSI that typically assume prescribed motion of structures in a flow field, this research develops LES based FSI studies for large-scale …
Shock Tube And Mid-Infrared Laser Absorption Measurements Of Ignition Delay Times And Species Time-Histories, Batikan Koroglu
Shock Tube And Mid-Infrared Laser Absorption Measurements Of Ignition Delay Times And Species Time-Histories, Batikan Koroglu
Electronic Theses and Dissertations
Energy consumption has increased dramatically as the world advances and becomes more industrialized. Over the next twenty five years, the U.S. Department of Energy expects the energy demand to increase by 29% with majority of the new energy coming from natural gas (methane). Another promising fuel source for power generation and transportation is the biofuels. The biofuel use in the US is shown to have increased substantially in the last decade. There are serious environmental concerns associated with greenhouse (e.g. carbon-dioxide) and toxic gas emissions (e.g. nitrogen oxides and aldehydes such as propanal) due to deriving energy from natural gas …
Phase Transformation And Growth Kinetics In Reaction Zone Between Uranium Alloy And Zirconium Diffusion Barrier, Young Joo Park
Phase Transformation And Growth Kinetics In Reaction Zone Between Uranium Alloy And Zirconium Diffusion Barrier, Young Joo Park
Electronic Theses and Dissertations
U-10wt.%Mo (U10Mo) alloy as a part of monolithic fuel system is being developed under Material Management and Minimization Reactor Conversion (MMMRC) program, tasked with replacing high-enriched uranium (HEU) fuel with low-enriched uranium (LEU) fuel in civilian research and test reactors. Use of U10Mo fuel alloy entails a Zr diffusion barrier to avoid the undesirable interdiffusion and reactions between the U10Mo and Al-alloy cladding. To better understand the interaction between these fuel system constituents, microstructural development and diffusion kinetics in U-Mo-Zr, U-Zr and fuel plate assembly processed by co-rolling and hot isostatic pressing (HIP) were investigated using a variety of analytical …
Estimating A Freight Mode Choice Model: A Case Study Of Commodity Flow Survey 2012, Nowreen Keya
Estimating A Freight Mode Choice Model: A Case Study Of Commodity Flow Survey 2012, Nowreen Keya
Electronic Theses and Dissertations
This research effort develops a national freight mode choice model employing data from the 2012 Commodity Flow Survey (CFS). While several research efforts have developed mode choice model with multiple modes in the passenger travel context, the literature is sparse in the freight context. The primary reasons being unavailability and/or the high cost associated with the acquisition of mode choice and level of service (LOS) measures – such as travel time and travel cost. The first contribution of the research effort is to develop travel time and cost measures for various modes reported in the CFS. The study considers five …
Modeling And Compensation For Efficient Human Robot Interaction, Nicholas Paperno
Modeling And Compensation For Efficient Human Robot Interaction, Nicholas Paperno
Electronic Theses and Dissertations
The purpose of this research is to first: identify the important human factors to performance when operating an assistive robotic manipulator, second: develop a predictive model that will be able to determine a user's performance based on their known human factors, and third: develop compensators based on the determined important human factors that will help improve user performance and satisfaction. An extensive literature search led to the selection of ten potential human factors to be analyzed including reaction time, spatial abilities (orientation and visualization), working memory, visual perception, dexterity (gross and fine), depth perception, and visual acuity of both eyes …
A Framework For Quantifying And Managing Overcrowding In Healthcare Facilities, Abdulrahman Albar
A Framework For Quantifying And Managing Overcrowding In Healthcare Facilities, Abdulrahman Albar
Electronic Theses and Dissertations
Emergency Departments (EDs) represent a crucial component of any healthcare infrastructure. In today's world, healthcare systems face growing challenges in delivering efficient and time-sensitive emergency care services to communities. Overcrowding within EDs represents one of the most significant challenges for healthcare quality that adversely impacts clinical outcomes, patient safety, and overall satisfaction. Research in this area has resulted in creating several ED crowding indices, such as National Emergency Department Overcrowding Scale (NEDOCS) and Emergency Department Work Index (EDWIN) that have been developed to provide measures aimed at mitigating overcrowding. Recently, efforts made by researchers to examine the validity and reproducibility …
A Neuroergonomics Study Of Brain Eeg's Activity During Manual Lifting Tasks, Awad Aljuaid
A Neuroergonomics Study Of Brain Eeg's Activity During Manual Lifting Tasks, Awad Aljuaid
Electronic Theses and Dissertations
Electroencephalography (EEG) has been shown to be a reliable tool in neuroergonomics studies due to the relatively low cost of brain data collection and limited body invasion. The application of EEG frequency bands (including theta, alpha and beta), enjoyed a wide range of interest in physical and cognitive ergonomics. The psychophysical approach has been used for decades to improve safe work practices by understanding human limitations in manual materials handling. The main objective of this research project was to study the brain's EEG activity expressed by the power spectral density during manual lifting tasks related to: 1) the maximum acceptable …
Computational Methods For Comparative Non-Coding Rna Analysis: From Secondary Structures To Tertiary Structures, Ping Ge
Electronic Theses and Dissertations
Unlike message RNAs (mRNAs) whose information is encoded in the primary sequences, the cellular roles of non-coding RNAs (ncRNAs) originate from the structures. Therefore studying the structural conservation in ncRNAs is important to yield an in-depth understanding of their functionalities. In the past years, many computational methods have been proposed to analyze the common structural patterns in ncRNAs using comparative methods. However, the RNA structural comparison is not a trivial task, and the existing approaches still have numerous issues in efficiency and accuracy. In this dissertation, we will introduce a suite of novel computational tools that extend the classic models …